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SHARE-BASED COMPENSATION PLANS - Schedule of Employee Stock Purchase Plan Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Shares purchased 56,885 25,834 0
Employee Stock Purchase Plan      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Shares purchased 6,632 6,334 6,305
Weighted average price of shares purchased (in dollars per share) $ 20.57 $ 16.64 $ 15.83
Compensation expense recognized $ 17 $ 17 $ 8
Tax benefits $ 6 $ 6 $ 3